27876505621 has 2 divisors, whose sum is σ = 27876505622. Its totient is φ = 27876505620.

The previous prime is 27876505619. The next prime is 27876505639. The reversal of 27876505621 is 12650567872.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15970640625 + 11905864996 = 126375^2 + 109114^2 .

It is a cyclic number.

It is not a de Polignac number, because 27876505621 - 2¹ = 27876505619 is a prime.

Together with 27876505619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27876505681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13938252810 + 13938252811.

It is an arithmetic number, because the mean of its divisors is an integer number (13938252811).

Almost surely, 2^27876505621 is an apocalyptic number.

It is an amenable number.

27876505621 is a deficient number, since it is larger than the sum of its proper divisors (1).

27876505621 is an equidigital number, since it uses as much as digits as its factorization.

27876505621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1411200, while the sum is 49.

The spelling of 27876505621 in words is "twenty-seven billion, eight hundred seventy-six million, five hundred five thousand, six hundred twenty-one".